In the past when a particular interface is green on one server, and red on another, it is due to the timing of the polling intervals. Pinging a down device will not get NetView that it is down. If your polling is 5 minute cycles, then within 5 minutes both of your servers should agree. To speed that up, you can go to the server with the green icon and do a NetView demand poll that just checks status of all the interfaces on that device. You should then see the interface icon go red if it is unavailable.